It embodies a twin burner of unique patented construction, such that the gas enters an annulus surrounding the mixing chamber, passes vertically downwards to the nipple, and thence upwards, drawing in air from the body of the lamp, the gas and air regulation being effected through the hinged door at the base of the lamp. Each burner is at the focus of a faceted Staybrite steel reflector of paraboloid form. Candle powers of 2000 for the six-light lamp and 3000 for the twelve-light lamp are obtained.

The reflectors are of the dispersive type and are designed to secure evenness of illumination over the carrigeway, rather than a high concentration of candle power in one direction. The patented burner possesses certain interesting features. The gas passes downwards through an annulus to the nipple, and thence upwards into the mixing chamber, drawing in air from the body of the lamp. This ensures efficient combustion and also obviates the necessity for an elaborate ventilating device to prevent the possibility of contamination of the primary air by products of combustion. Moreover, with a bottom door, regulation of the gas and air, replacement of the mantles and cleaning, can all be effected from the base, very important maintenance considerations.

With staggered spacings of 150 feet and for roads of normal width, Class F and E illumination is obtained with the six-light and twelve-light lamps respectively. Mounting heights of 18 to 25 feet for the six-light and 21 to 25 feet for the twelve-light lamp are recommended. The lantern is ususally advertised as achieving a Class F illumination with staggered spacing of 150 feet and a mounting height of 18 to 25 feet.

The reflectors may be set to any reasonable predetermined vertical and azimuthal angle, and are generally adjusted to throw the maximum beam at an azimuthal angle of 10° into the road for staggered systems, and 0° azimuth for central suspension.

The burners and reflectors are housed in a lantern of square cross section, slightly tapering towards the base, and fitted with pyramidal roof and base. From two to sixteen mantles can be housed in the same lantern, a valuable asset when conversions to higher power units are required by increase in traffic and greater necessity for a higher degree of illumination.

Has a maximum candle power of 2000 with a total gas consumption of 15 cubic feet per hour. The two 56-facet Paraboloid Metal Adjustable Refectors are of the dispersive type. The case is of modern design, square in plan, and tapered from the waist downwards. Gas and air regulator is housed in the body of the lamp and free from contamination of the primary air by products of combustion. Provides a good Class F Illumination for roads of normal width. Often shown advertised on Adastra Sectional Steel Columns. Later described as a Group "A" lantern. Is extensively installed, and is ideal for competitive schemes being highly efficient, soundly constructed and low priced.

Redesigned in 1945, it's intended for use in Group A roads at a mounting height of 25'. It houses 6-12 mantles and can be arranged for both suspension or upright mounting. Reflectors can be adjusted horizontally and vertically for even spread of illumination. This adjustability permits the most effective distribution of light for variations in the configuration of the road including bends, gradients and varying road widths.

Adverts in 1938 state that it's available in Upright (Post Top), Suspension and Brimax Types. The Brimax is the version with the side-entry double-arm bracket.

Redesigned in 1945, the term "Brimax" seems to have been dropped. The lantern is now part of the Maxilla range, for Group "B" lighting at a mounting height of 13-15 feet. The swan neck is an integral part of the lantern. Reflectors can be adjusted vertically for even spread of illumination.

Redesigned in 1945, a mounting height of 13-15 feet is suggested for Group "B" roads. Reflectors can be adjusted vertically for even spread of illumination.

Especially designed for residential areas and roads for Group 'B' lighting (as per the MOT Final Report). They have a mounting height of 13-15 ft. and are a vast improvement on the pre-war Maxilla lanterns. Standard interchangeable parts have been adopted where possible which has reduced the cost of manufacture and the number of components required as spares. The Suspension Lanterns are all fitted with a concealed safety chain device. Fixed Nipples and constant pressure governors are included as standard fittings. Street lighting effectiveness has been enhanced by the adjustability of the faceted reflectors, which are constructed of aluminium anodised by an improved process, permitting effective distribution of light for variations in the configuration of the road, including bends, gardients and varying road widths. Rectangular sides replace the tapered in order to facilitate easy replacement of five glass panes (sides and base), each being of equal size. The whole of the burner assembly, from nipple to pre-heater, is the same for all sizes of pre-heaters from 2 to 6 light. The standard venturi tubes and fixed nipple are controlled to the size required for the particular size of preheater. The venturi maintains the 7-1 ratio whatever quantity of gas is passed. The Astragels are made as narrow as possible, so that, with the frog sprays twisted to present the smallest surface to the path of light, shadows have been reduced to a minimum. The hoods are stamped in one piece throughout, ensuring resistance to weather and are constructed of copper. Neatly housed and concealed behind the facetted reflectors of the Maxilla Lantern are the ignition device, clock controller and constant pressure governors. The reflectors are supported by a tripod fitted to the venturi and permitting vertical adjustment. The control assembly can be easily removed with Comet igniter, leaving interior of lantern free for cleaning. The fly-cap tighted union at the base of the nipple holder permits this easy removal of the controls, faceted reflector and venturi tube, the latter being "olived" at the top to make a gas-tight push fit connection within the burner supply tube.

The whole reflector unit is an accurate stamping in anodised light alloy sheet. By ingenious design, each pane of glass is the same size to facilitate replacement and reduce glass stocks. Has many interchangable parts with the Maxilla.

The Suspension Lanterns are all fitted with a concealed safety chain device. Fixed nipples and constant pressure governors are included as standard fittings to ensure the laboratory results are reproduced. Rectangular sides replace the tapered in order to facilitate easy replacement of five glass panes (side and base), each being of identical size. Heat-resisting glass panes are introduced into the lantern with the larger size burner assembly, and are placed opposite the 40-facetted reflector. The whole of the burner assembly, from nipple to pre-heater, is the same for all lanterns and for all sizes of pre-heaters from 2 to 6-light.

Suitable for all Group B thoroughfares. Upright and suspension lanterns available in sizes 2 lt. to 6 lt. with 40 facetted reflector. Consumption controlled to 2½ cubic feet per burner-hour by constant pressure governor and fixed nipple.

Redesigned in 1945, a mounting height of 13-15 feet is suggested for Group "B" roads. Reflectors can be adjusted vertically for even spread of illumination.

Especially designed for residential areas and roads for Group 'B' lighting (as per the MOT Final Report). They have a mounting height of 13-15 ft. and are a vast improvement on the pre-war Maxilla lanterns. Standard interchangeable parts have been adopted where possible which has reduced the cost of manufacture and the number of components required as spares. The Suspension Lanterns are all fitted with a concealed safety chain device. Fixed Nipples and constant pressure governors are included as standard fittings. Street lighting effectiveness has been enhanced by the adjustability of the faceted reflectors, which are constructed of aluminium anodised by an improved process, permitting effective distribution of light for variations in the configuration of the road, including bends, gardients and varying road widths. Rectangular sides replace the tapered in order to facilitate easy replacement of five glass panes (sides and base), each being of equal size. The whole of the burner assembly, from nipple to pre-heater, is the same for all sizes of pre-heaters from 2 to 6 light. The standard venturi tubes and fixed nipple are controlled to the size required for the particular size of preheater. The venturi maintains the 7-1 ratio whatever quantity of gas is passed. The Astragels are made as narrow as possible, so that, with the frog sprays twisted to present the smallest surface to the path of light, shadows have been reduced to a minimum. The hoods are stamped in one piece throughout, ensuring resistance to weather and are constructed of copper. Neatly housed and concealed behind the facetted reflectors of the Maxilla Lantern are the ignition device, clock controller and constant pressure governors. The reflectors are supported by a tripod fitted to the venturi and permitting vertical adjustment. The control assembly can be easily removed with Comet igniter, leaving interior of lantern free for cleaning. The fly-cap tighted union at the base of the nipple holder permits this easy removal of the controls, faceted reflector and venturi tube, the latter being "olived" at the top to make a gas-tight push fit connection within the burner supply tube.

The Suspension Lanterns are all fited with a concealed safety chain device. Fixed nipples and constant pressure governors are included as standard fittings to ensure the laboratory results are reproduced. Rectangular sides replace the tapered in order to facilitate easy replacement of five glass panes (side and base), each being of identical size. Heat-resisting glass panes are introduced into the lantern with the larger size burner assembly, and are placed opposite the 40-facetted reflector. The whole of the burner assembly, from nipple to pre-heatr, is the same for all lanterns and for all sizes of pre-heaters from 2 to 6-light.

Suitable for all Group B thoroughfares. Upright and suspension lanterns available in sizes 2 lt. to 6 lt. with 40 facetted reflector. Consumption controlled to 2½ cubic feet per burner-hour by constant pressure governor and fixed nipple.